Pneumatically-operated chain saw.



C. I. ULS ON.

PNEUMATICALLY OPERATED CHAIN SAW. APPLICATION FILED MAYZH. I912. RENEWED AUG. 2r. ran.

1,260,702. Patented ar. 26, 1918.

To all whom it may concern."

eirAnLEs J. oLsoN, oniausxneoir, mrcniem.

PIYEUMA'IICgALLY-OPEBATED GHEAIN SAW.

Specification. of Letters Patent. Patented M31526, 1918.

' Application filed May 28, 1912, Serial No. 706,264. Renewed-August 21,1917. Serial No. 187,482.

Be it known that I, CHARLES J. OLsbN, a citizen of the United States, residing at Muskegon, in the county bf Muskegon and State of Michigan, have invented certain new and useful Improvements in Pneumatically-Operated Chain Saws, of which the following is a specification.

This'inve'ntion relates to chain saws and has as" its object to provide a highly efficient pneumatically operated saw of this t pe.

One aim of the invention is to provide a pneumatic .saw of the type mentioned which will not noticeably vibrate while in operation, will be practicallynoiseless' and may be used in anumber of different ways. The saw embodying the present invention, while particularly well designed for use in cutting. mortises, may in .diiferent sizes, be

employed in a number of different ways.

For a full understanding of the invention reference is tofbe had to the following description and accompanying which Figure 1 is a'view' partly in side elevation and partly in vertical longitudinal section of the saw constructed in accordance with the present invention.

Fig. 2 is a topplan view thereof, parts being shown in section. I

Correspondingand like arts are referred to in the following descripfidn and indicated all the viewsof the accompanying drawmgsiby the same reference characters.

. In the drawings, the power shaft of the drawing, in

saw is indicated by the nuineral 1 and this shaft, supportsthepowersprocket of the saw and the compressedfair motors which operate to rotate the shaft. The sprocketi mentioned includes iniits structure a body consisting of acollan'2 to the opposite faces of which are secured flanges 3, the parts, being connected preferably by rivets. .This collar iske ed or otherwise. secured upon the sha 1 at a point substantially, midway between the ends of the shaft and, as will be presently. explained is located bewhich power is derived. The sprocket also includes in its structure-an annular disk 4 which is fitted between annular plates. 5 and secured thereto by rivets 6, the outer eriphcries of the plates 5 being located e'yond the peripheries of the disk'4, as clearly shown in.-Fig. 2 of the drawings. This per tion of the sprocket is rotatably received be-' tween the flanges 3 of the body thereof and a number of bearing rollers 7 are arranged between the flanges 3 and between the outer periphery of the collar 2 and theinner peripheries of the disk 4 and lates 5. The periphery of the disk 4 is of't ie form shown in Fig. 1 of the drawin s and is provided with a number of shoul ers 8 and teeth 9. Each of the shoulders 8-has an abrupt face 10 which is radial to the axis of the disk and between each of the shoulders 8 the periphery of the disk eiitends tangentially withv respect to the axis thereof as indicated at 11. Each tooth 9 is formed upon one of the tangentially extending peripheral portions of the disk and consequently each tooth is located in advance of one of the shoulders.8. I

The stock of the saw consistsof a plate 18 and cheek-plates 19 which are riveted or otherwisesecured against the opposite faces of the plate18. The plate 18 may be of any desired len h and its upper and lower edges are paralle as shown in Fig. 1 its end-edges being concave as at 20 so as to receive the power and driven sprockets of the saw a shown-in the said figure.

The cheek-plates 19 are of greater length than the plate 18 and these plates at the forward or working end of the saw are consequently spaced, The drivensprocket of the saw is arranged betweenthe said spaced portions of the lates 19 as will now be explained. A dis 27-is riveted or otherwise secured as at 28 between the spaced portions of the plates 19 and is of circular outline. The sprocket properis in the form of an annulus 29 having a circular inner periphery and this annulus is arranged between the plates 19 and in position surrounding the disk 27. 1 A number of hearing rollers '30 are arranged between the periphery of the disk and the said inner periphery of the annulus and serve to reduce friction between the parts as theannulus' rotates. The outer periphery of 'the member 29 is identical in form with-that of the disk 4 of the power awings.

tion of Fig.1 of the -.The saw roper consists of a number inspec-.

a links 31 which are detachably connectedto form a chain which is'trained about the power and driven sprockets in a manner shown in Fig. 1 of the drawings.

It will be observed that the toothed edges I of the links project beyond the edges of the cheek-plates 19, both at the sides and ends ofthese plates so that the upper, lower, or

- be stated, however, that each of the compressed air motors above mentioned includes a casing consisting of a substantially annular body 39 to the opposite sides of'which are secured heads 40 and 41. These heads are formed axially with openings through,

which the shaft 1 is rotatably fitted and the head 41 of each casing is provided with a laterally projectin flange 42 which is secured by means 0 bolts or similar fasten- 1ng devices 43 to the inner ends of the cheekplates 19. Each head 41 is further formed with a rearwardly projecting flange 44 and the handle of the saw which is indicated in general by the reference numeral 45 is formed in its forward end with forwardly pro ecting flanges 46 to which the flanges 44 are secured by means of screws 47.

It will be readily understood that the principles of the invention could be embodied in a band-saw, if desired.

Having thus described the invention what is claimed as new is 1. In a chain saw machine, a handle," a head carried by the handle, spaced motors 7 supported by the head, the axis of the handle being located in a plane between the m0- tors, a sprocket arranged between the motors and driven therefrom, and a chain saw trained about the sprocket.

2. In a chain saw machine, a handle, a

head carried by the handle, motors sup ported by the head in spaced relation toeach other, the axis of the handle being located in a plane between the motors, a shaft extending between the motors and driven thereby, a stock extending from the head in a plane between the motors, a chain saw supported for travel upon the stock, and operative connection between'the said shaft and the said chain saw.

3. In a chain saw machine, a handle, a head carried thereby, motors supported upon the head in spaced relation to each other, the axis of the handle being located in a plane between the motors, a stock extending from the head between the motors, a shaft extending between the motors and driven therefrom, a sprocket carried by the shaft and rotated thereby, a sprocket carried at the end of the stock remote from the motor shaft, and a chain saw trained over' the said sprockets and traveling upon the stock.

4. In a device of the class described, a stock comprising a plate, cheek-plates secured uponoppositesides of the first mentioned plate and projecting at correspond ing ends beyond one end of the first mentioned plate, a disk mounted between said projecting ends of the second mentioned plates, an annular sprocket rotatably mounted upon the disk between the said projecting ends of the second mentioned plates, a sprocket mounted at the other end of the first mentioned plate a chain saw trained about the said sprockets, and means for rotating the last mentioned sprocket.

In testimony whereof I afiix my signature in presence of two witnesses.

CHARLES J. OLSON. [1 s.]

Witnesses:

FRANK E. HATHAWAY, LEO CUDDOHY. 

